Apple Final Cut Pro 6 - Manual (Page 519)

186 Part II Rough Editing
As you can see in the picture below, tracks A1 and A2 are not highlighted because Auto
Select is not enabled for those tracks.
The Auto Select controls provide precise control over which part of the Timeline you
cut, copy, or delete from. Suppose you have a sequence with one video and two audio
tracks. By disabling Auto Select on audio tracks A1 and A2, you can select items on
track V1 by setting In and Out points in the Canvas or Timeline. Items in the audio
tracks are not selected.
Auto Select is enabled for
these two tracks.
In and Out points
Before deleting